package com.zym.community.entity;

import io.swagger.annotations.ApiModel;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * 封装分页相关的信息
 */
@Data
@ApiModel("分页类")
public class Page {

    //当前页码
    private int current = 1;
    //显示上限
    private int limit = 10;
    //数据总数（用于计算总页数）
    private int rows;
    //查询路径（用于复用分页地址）
    private String path;

    //获取当前页的起始行
    public int getOffset(){
        return (current - 1) * limit;
    }

    //获取总页数
    public int getTotal(){
        if (rows % limit == 0){
            return rows / limit;
        }else {
            return rows / limit + 1;
        }
    }

    //获取起始页码
    public int getFrom(){
        int from = current - 2;
        return from < 1 ? 1 : from;
    }

    //获取结束页码
    public int getTo(){
        int to = current + 2;
        int total = getTotal();
        return to > total ? total : to;
    }
}
